[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: Grouping simple flat structure

Subject: Re: Grouping simple flat structure
From: "Andrew Welch" <andrew.j.welch@xxxxxxxxx>
Date: Mon, 17 Mar 2008 13:01:00 +0000
Re:  Grouping simple flat structure
On 17/03/2008, Ian Proudfoot <ian.proudfoot@xxxxxxxxxxx> wrote:
> I have a blind spot when it comes to grouping flat XML structure using XSLT
>  1.0.
>
>  My source XML structure is typically as follows (simplified for clarity):
>
>  <section>
>   <title/>
>   <warning/>
>   <warning/>
>   <para/>
>   <warning/>
>   <warning/>
>   <para/>
>   <para/>
>  </section>
>
>  I would like to group adjacent <warning> elements to give this structure:
>
>  <section>
>   <title/>
>   <w-group>
>     <warning/>
>     <warning/>
>   </w-group>
>   <para/>
>   <w-group>
>     <warning/>
>     <warning/>
>   </w-group>
>   <para/>
>   <para/>
>  </section>
>
>  I've tried using Muenchian Grouping, but I'm going wrong somewhere. I
>  started by trying to identify the start of each group using <xsl:template
>  match="warning[(preceding-sibling::*[1])[not(self::warning)]]">... As a
>  starting point is this correct, it does seem to capture the first warning in
>  each group? After that I cannot grab the following <warning> sibling
>  elements correctly.

You can use the "sibling-recursion" template (also known as the
"modified identity tempate") which walks the sibling axis one node at
time:

   <xsl:template match="@* | node()">
      <xsl:copy>
         <xsl:apply-templates select="@*"/>
         <xsl:apply-templates select="node()[1]"/>
      </xsl:copy>
      <xsl:apply-templates select="following-sibling::node()[1]"/>
   </xsl:template>

Then have a specific template to process <warning> elements - output
the container element and then process the warning using a special
moded template to differentiate it from this template.  The next
non-warning element is processed after the container element.

  <xsl:template match="warning">
	    <w-group>
		      <xsl:apply-templates select="." mode="copy"/>		
	    </w-group>
	    <xsl:apply-templates
select="(following-sibling::*[not(self::warning)])[1]"/>
  </xsl:template>

This is the template that effectively groups the warnings - it copies
the current warning (or probably processes it in your real transform)
and then processes the next node as long as it's a warning:

    <xsl:template match="warning" mode="copy">
	    <xsl:copy-of select="."/>	
	    <xsl:apply-templates
select="following-sibling::*[1][self::warning]" mode="copy"/>
    </xsl:template>


cheers
-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/

Current Thread

PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.